“Improved security substrate incorporating a security feature and security article comprising thereof

Abstract

The present invention relates to improvements in security substrates incorporating a security feature which inhibits the ability of counterfeiters to produce counterfeit notes which is formed from at least two layers which are indistinguishable in reflected light but are distinguishable in transmitted light. The security substrate comprises an at least partially light transmitting carrier supporting a security feature and the security feature comprises at least first and second layers at least one of which covers an area which is less than a full surface area of the carrier and which at least partially overlaps the other layer. The layers have substantially the same colour and texture and the reflective contrast ratio of the overlapping areas and the non-overlapping areas is less than 20% and the transmissive contrast ratio of the overlapping areas and the non-overlapping areas is greater than 3%.